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Relationship between Plans Benefit Obligations and Assets (Detail) - Pension Benefits - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
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U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | $ 617,255 | $ 591,948
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 510,984 | 489,918
Plans with projected benefit obligations in excess of plan assets, plan asset | 487,233 | 437,481
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 487,233 | 437,481
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plans with projected benefit obligations in excess of plan assets, benefit obligation | 152,533 | 147,560
Plans with accumulated benefit obligations in excess of plan assets, benefit obligation | 43,054 | 44,797
Plans with assets in excess of projected benefit obligations | 41,616 | 48,324
Plans with assets in excess of accumulated benefit obligations | 138,408 | 138,241
Plans with projected benefit obligations in excess of plan assets, plan asset | 136,861 | 130,605
Plans with accumulated benefit obligations in excess of plan assets, plan asset | 29,855 | 31,653
Plans with assets in excess of projected benefit obligations, plan asset | 52,099 | 49,323
Plans with assets in excess of accumulated benefit obligations, plan asset | $ 159,105 | $ 148,275

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